'ready_for_review' state not supported for 'pull_request_target'

[JanKrivanek]

Context

When changing

  pull_request:
    types: [opened, ready_for_review]

to

  pull_request_target:
    types: [opened, ready_for_review]

I got

.github\workflows\review-on-open.agent.md:14:4: error: '1': value must be one of 'assigned', 'unassigned', 'labeled', 'unlabeled', 'opened', 'edited', 'closed', 'reopened', 'synchronize', 'converted_to_draft', 'locked', 'unlocked', 'enqueued', 'dequeued', 'review_requested', 'review_request_removed', 'auto_merge_enabled', 'auto_merge_disabled'

Expected

The transition is supported for both trigger types

[JanKrivanek]

I created a branch with fix, but I cannot create a PR due to lacking contributor perms: https://github.com/github/gh-aw/compare/main...JanKrivanek:gh-aw:patch-1?expand=1